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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
1940536602 I_kwDOAMm_X85zqj0a 8298 cftime.DatetimeNoLeap incorrectly decoded from netCDF file TomNicholas 35968931 open 0     14 2023-10-12T18:13:53Z 2024-01-08T01:01:53Z   MEMBER      

What happened?

I have been given a netCDF file (I think it's netCDF3) which when I open it does not decode the time variable in the way I expected it to. The time coordinate created is a numpy object array

What did you expect to happen?

I expected it to automatically create a coordinate backed by a CFTimeIndex object, not a CFTimeIndex object wrapped inside another array type.

Minimal Complete Verifiable Example

The original problematic file is 455MB (I can share it if necessary), but I can create a small netCDF file that displays the same issue.

```python import cftime

time_values = [cftime.DatetimeNoLeap(347, 2, 1, 0, 0, 0, 0, has_year_zero=True)] time_ds = xr.Dataset(coords={'time': (['time'], time_values)}) print(time_ds) time_ds.to_netcdf('time_mwe.nc') <xarray.Dataset> Dimensions: (time: 1) Coordinates: * time (time) object 0347-02-01 00:00:00 Data variables: empty python ds = xr.open_dataset('time_mwe.nc', engine='netcdf4', decode_times=True, use_cftime=True) print(ds) <xarray.Dataset> Dimensions: (time: 1) Coordinates: * time (time) object 0347-02-01 00:00:00 Data variables: empty ```

MVCE confirmation

  • [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [X] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [X] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [X] New issue — a search of GitHub Issues suggests this is not a duplicate.
  • [X] Recent environment — the issue occurs with the latest version of xarray and its dependencies.

Relevant log output

No response

Anything else we need to know?

No response

Environment

cftime 1.6.2 netcdf4 1.6.4 xarray 2023.8.0

 
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     xarray 13221727 issue

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